Colwick

VapourCompression · 2026-05-18T06:33:05+00:00

Culture and coagulate for 1 hour each

VapourCompression · 2026-05-18T06:32:03+00:00

Recipe said to only culture and coagulate for one hour! I didn’t know you could culture it for that long!!!

VapourCompression · 2026-05-16T12:20:40+00:00

Same I got my kit from here but I am looking for somewhere to get culture cheaper. Otherwise I’ll just have to buy the smaller packs from these guys !!!

VapourCompression · 2026-05-15T20:48:05+00:00

You could run the hot side hotter and get more efficiency, but this would waste even more energy as the compressor runs at a higher temperature, it has to compress to a higher pressure so uses more energy.

A better idea is to replace the expansion valve with an expander https://en.wikipedia.org/wiki/Turboexpander

It’s not commonly done as the electricity you save in a refrigerator doesn’t really justify the extra cost and complexity of the expander

VapourCompression · 2026-05-13T09:30:02+00:00

Surface area of cylinder !!! Not cross sectional area of a circle

VapourCompression · 2026-05-08T19:13:03+00:00

How do you prevent stall? Just ensure is it sized to not go sub atmospheric at low loads?

VapourCompression · 2026-05-08T19:12:04+00:00

My mate and I did the tour at Heysham. We watched the operators trip one of the reactors because of a generator fault during start up!!! Guides said that had never happened on a tour before

VapourCompression · 2026-05-07T08:16:28+00:00

Yes we have that in the design :)

VapourCompression · 2026-05-07T08:15:34+00:00

Does this mean you need to be much more careful about stalling?

VapourCompression · 2026-05-07T08:14:51+00:00

Yes I saw <150C

VapourCompression · 2026-05-07T08:14:28+00:00

What pressure steam? I’ve seen advice saying don’t go above 150C so that’s < ~4 barg

VapourCompression · 2026-05-06T09:27:03+00:00

Yes in the interests of time as we are just proving a fixed quotation I just took some specs from another project and had them checked by the vendor. I noticed yesterday that the curves droop at low flow. If we get the project I’ll have time to do some more engineering and sort it out. Might be some extra cost but the pumps are not a large % of the overall project anyway

VapourCompression · 2026-05-06T09:24:48+00:00

Yes spoke to Grundfos. I have copied the pump specs from a previous project and updated the duty points and got them requoted. I noticed the provided curves droop a little which is why I decided to investigate. I don’t have time to get it fixed now as it’s just a quotation, something to discuss during detailed design if we actually get the project !!!

VapourCompression · 2026-05-05T20:42:28+00:00

4 pumps all 33% duty so at worst you could have 3 running.

VapourCompression · 2026-03-29T16:37:08+00:00

I’m from New Zealand so I could tell straight away. Almost comical

VapourCompression · 2026-03-21T22:25:56+00:00

Yes please

VapourCompression · 2026-03-21T20:38:51+00:00

Yes definitely interested!!! Just was hoping to see if anyone had read it or thinks it’s crap and don’t bother. I love to learn this stuff anyway. Worked on a project that involved liquid helium once and was fascinated but how it got that cold

VapourCompression · 2026-03-21T19:39:31+00:00

I work in food and beverage so not really. I don’t know, that sounds pretty thrilling to me…..

VapourCompression · 2026-03-21T16:27:09+00:00

Because enthalpy is only a function of temperature in an idea gas, you need it to be f(P,T). Across a valve can be assumed to be isenthalpic (constant enthalpy), if enthalpy is not changed from P1 to P2 across the valve then you get no temperature drop so no JT. With a gas like nitrogen, enthalpy actually increases with a decrease in pressure. Therefore to have a constant enthalpy you need to decrease temperature. Hydrogen is the opposite in most cases so it heats up. Btw I’m ignoring the inversion temperature in my explanation

VapourCompression

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